Adhesive rubber composition.



.: SLOCUM, OF MEDAN, PROVINCE OF DELI, SUMATRA, DUTCH EAST INDIES, AS'BIGNOR'TO GENERQL RUBBER C OI lIIPANY, A COBPOTION OF NEW Patented lFeb. 11L, rare.

annsnx.

. I ADHESIVE RUBBER COSITIGN.

293 95 Specification of Letters Patent.

Ito Drawing.

To all whom it may concern:

Be it known that I, EDWARD MARK SLO: h

GUM, a citizen of the United States, residing at Medan, Province of Deli, Sumatra, Dutch East Indies, have invented certain new and useful Improvements in Adhesive Rubber Compositions, of which the following is a full, clear, and exact description.

This invention relates to a rubber composition and more particularly to an adhesive rubber composition adapted for surfacin tapes and for use in general where an a esive bond is required.

Heretofor'e in the preparation of adhesive compositions of the kind mentioned rubber has been mixed with asphalt, certain oxidized or sulfurized oils, etc., but the material so produced have hardened and lost their adhesive characterlstics to a greater. or less dc ree upon standing. It is accordingly my principal object to prepare an adhesive composition of the type described having a substantially permanent stickiness or adhesive ness. Another object is to devise a simple process for manufacturing the adhesive material.

The composition which I have devised in accordance with the ob'ects mentioned may be made as follows: astor oil is heated without access of air until the. oil has lost 5 to 10% of its volume and has become thickened. The oil so thickened is then mixed with rubber or a composition containin rubber preferably by'dissolving one part 0 thickened castor oil in two arts of gasolene or other solvent and stirrlng this mixture into five to six parts of uncoagulated latex. Prior to or subsequent to coagulation or at any time prior to vulcanization sulfur or other vulcamzing agent may be added to the mass. The 'resu ting product after coagulation, etc. is a highly adhesive form of rubber and shows its tenacity by extenoil by a ing even after longstanding, showing in t is respect a well defined diiference from rubber compounded with other boiled Application flied January 8, 1917. Serial No. 141,290,

oils21 oxidized oils, etc, which soon become In connection with the above rocess it is pointed out that the thickene oastor oil ma be emulsified instead of being dissolved an may be incorporated in the form of such emulsion. Further, the oil may be saponified and added to the latex in water solution. It Wlll also be observed that the admixture of the oil with latex may take place b efore or after coa lation.

The oi s in general which may be used for the production of an article having the desired characteristics are-thus non-drying oils which, although they do not harden or dry to a'solid film upon exposure, do assume a mmy, sticky condition when ex- .posed. he 011s of the referred type apear to owe their desirab e properties as set orth to the presence of the hydroxy group in their constitution. Variousoils or admixtures thereof of the referred ty e ma be employed, and although a g yceri namey, Castor oil, has been set forth in the embo iment given, it will be understood that compounds containing fatty-acid radicals, fatty acids and polymerization products in gengral of this type of substance may be use Thickened castor oil is preferably employed in view of its ability to remain fluid even when exposed in thin layers to air for a considerable period. A sample of the oil treated by heatin liquid form thoug and exposed to the air for a period exceedin nine months.

aving thus described my invention, what I claim and desire to protect by Letters Patent is 1. An adhesive material comprising a non-drying oil of the class which assumes a gummy condition when exposed and rubber-containing latex coagulated with the oil. 2. An adhesive composition comprising a non-drying oil thickened by heating, and a rubber-containing latex'coagulated with the oil in solution. I

3. An adhesive material comprising castor lid till

as above, retained the spread in a thin layer mam oil, and a'rubber-contaim'ng latex coagulated 5. A process for producing an adhesive with the oil. material which comprises mixing thickened 10.

4.,.A,process 2601 producing gm .edhesive wastor oil'dissqlvedin mvplatile'selvent with material which. com rises amxmg. a nonrubberecqntflhining labemand coagulating the 5 drying oil of a class w ich assumes a gummy mass. condition upon ex s re in a yqlgtile solvent Signed at New York, cel nty and filqate of with ubber-containing latex, andeqagqlat- New Ygpk time 5 da of- J annargj1917. ing the mass. *EDW OOUM; 

